问题标题:
Ihaveboughtthreeballpointpens,noneof_____writessmoothly.
问题描述:
Ihaveboughtthreeballpointpens,noneof_____writessmoothly.
梁晓庚回答:
which
两个句子用逗号隔开,一主一从;第二个是非限制性定语从句,which代替先行词threeballpointpens,构成noneofwhich结构,在从句中作主语.
若要填them,逗号需换成句号,改为两个并列句.
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